//使用抽象数据类型（ADT）风格的链表
//与 list.c 一起编译
#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include "list.h"
void showmovies(Item item);
char * s_gets(char * st, int n);
int main(void)
{
    List movies;
    Item temp;

    //初始化
    InitializeList(&movies);
    if(ListIsFull(&movies))
    {
        fprintf(stderr, "No memory available! Bye!\n");
        exit(1);
    }

    //获取用户输入并储存
    puts("Enter first movie title:");
    while(s_gets(temp.title, TSIZE) != NULL && temp.title[0] != '\0')
    {
        puts("Enter your rating <0-10>:");
        scanf("%d", &temp.rating);
        while(getchar() != '\n')
            continue;
        if(AddItem(temp, &movies) == false)
        {
            fprintf(stderr, "Problem allocating memory\n");
            break;
        }
        if(ListIsFull(&movies))
        {
            puts("The list is now full.");
            break;
        }
        puts("Enter next movie title (empty line to stop):");
    }

    //显示
    if(ListIsEmpty(&movies))
        printf("No data entered. ");
    else{
        printf("Here is the movie list:\n");
        Traverse(&movies, showmovies);
    }
    printf("You entered %d movies.\n", ListItemCount(&movies));

    //清理
    EmptyTheList(&movies);
    puts("Bye!");

    return 0;
}

void showmovies(Item item)
{
    printf("Movie: %s  Rating: %d\n", item.title, item.rating);
}

char * s_gets(char * st, int n)
{
    char * ret_val;
    char * find;

    ret_val = fgets(st, n, stdin);
    if(ret_val)
    {
        find = strchr(st, '\n');
        if(find)
            *find = '\0';
        else 
            while (getchar() != '\n')
                continue;
    }
    return ret_val;
}